You do realize in Giolog you don't have to do the job quests. Or if your aware of this read below.
I personally have made a character for every class in Flyff, and I've never received that ( I notice you're a ranger, I have one too and again: I've never had this problem). SOO its probably a bug/error that needs to be fixed by 2bartz and if that is in fact the case, I'm afraid you cannot get rid of it. Do what someone above me suggested and move it to your bag.
Suggestions
-Move this thread to the "Report/bugs" thread in the main forum.
-If this is REALLY bugging you make a new character.
Hope I Helped
Best Regards,
Keegan